Just wondering... Is it OK to leave the AC adapters used by many gadgets plugged in while it isn't connected to anything? For example, AC->DC charger for a cellphone left plugged under my desk with the end of the cord on the desk in a handy, out of the way location. I assume that an AC->AC adapter should be OK, but an AC->DC might have problems since it has the rectifier and filter caps always trickling a bit of current through them. Even worse would be the switching supply of a laptop when the laptop was elsewhere. Other than the obvious electrical spikes that could damage anything, is it bad to leave these things plugged in?